Have found out some more information. I am running xrdp on my pi and connecting from my Mac using Microsoft Remote Desktop Beta. I decided to see if I got the same on the pi directly connected via a monitor. Interestingly, dugeoncrawl doesn’t run - it gives the error:
0:1(10): error: GLSL 3.30 is not supported. Supported versions are: 1.10, 1.20, 1.00 ES, and 3.00 ES
However, if I change the command to:
MESA_GL_VERSION_OVERRIDE=3.0 MESA_GLSL_VERSION_OVERRIDE=330 target/release/dungeoncrawl
It runs and the line doesn’t appear i.e. all is good
So the problem only occurs when connected remotely.
Andrew